get the application's resources languages

Question

Is it possible, at runtime, to know which resources languages are embedded in my app?

i.e the presence of this folders:

values-en
values-de
values-fr         


        

Answer 1

For anyone using Gradle, I did it like so below it traverses all strings.xml, grabs the directory names and figures out the locales from there. It adds a String[] to BuildConfig which you can access as BuildConfig.TRANSLATION_ARRAY

task buildTranslationArray << {
    def foundLocales = new StringBuilder()
    foundLocales.append("new String[]{")

    fileTree("src/main/res").visit { FileVisitDetails details ->
        if(details.file.path.endsWith("strings.xml")){
            def languageCode = details.file.parent.tokenize('/').last().replaceAll('values-','').replaceAll('-r','-')
            languageCode = (languageCode == "values") ? "en" : languageCode;
            foundLocales.append("\"").append(languageCode).append("\"").append(",")
        }
    }

    foundLocales.append("}")
    //Don't forget to remove the trailing comma
    def foundLocalesString = foundLocales.toString().replaceAll(',}','}')
    android.defaultConfig.buildConfigField "String[]", "TRANSLATION_ARRAY", foundLocalesString

}
preBuild.dependsOn buildTranslationArray

So after the above task occurs (on prebuild) the BuildConfig.TRANSLATION_ARRAY has your list of locales.

I'm not a Gradle/Groovy expert so this could definitely be a bit neater.

Reasoning - I ran into too many issues implementing pawelzieba's solution, I had no reliable strings to 'compare' as the translations were crowdsourced. The easiest way then was to actually look at the values-blah folders available.